Análisis comparativo del embalse Bullileo durante las crecidas invernales de junio y agosto de 2023
Loading...
Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Concepción
Abstract
Durante el invierno de 2023, la zona de Chile Central se vió afectada por la llegada de dos ríos atmosféricos. La combinación inusual de las variables climatológicas que influyeron en la intensidad de este fenómeno ocasionó inundaciones en las regiones del Maule, Ñuble y Biobío. Los eventos de junio y agosto provocaron que la gran mayoría de los embalses se vieran afectados, dentro de los cuales el Embalse Bullileo fue el único en superar su capacidad máxima en ambos eventos. Por esta razón, se implementó un modelo de simulación con el objetivo de analizar diferentes escenarios de manejo de los caudales de salida del embalse para la regulación de las crecidas. En junio, las simulaciones indicaron que el embalse habría superado su capacidad máxima hasta en el escenario más favorable, poniendo de manifiesto la excepcionalidad del evento. En agosto, el embalse aún se mantenía por sobre el margen de seguridad, por lo que se decidió accionar las válvulas con el propósito de alcanzar dicho margen a fines de septiembre. Las simulaciones determinaron que esta gestión contribuyó accidentalmente a reducir las crecidas de agosto durante un tiempo considerable. En general, los resultados de las simulaciones se contrastaron con la verdadera capacidad operativa de las válvulas, descartando aquellas que proponían una apertura mayor a la realmente posible. El análisis concluyó que la gestión llevada a cabo en el Embalse Bullileo se adaptó adecuadamente a las circunstancias, lo que permitió completar la fase de llenado y priorizar la seguridad del embalse.
During the winter of 2023, the Central Chile region was affected by the arrival of two atmospheric rivers. The unusual combination of climatological variables influencing the intensity of this phenomenon caused flooding in the Maule, Ñuble, and Biobío regions. The events in June and August led to the majority of reservoirs being impacted, with the Bullileo Reservoir being the only one to exceed its maximum capacity in both occurrences. Consequently, a simulation model was implemented with the aim of analyzing different scenarios for managing the reservoir's outflow to regulate flood control. In June, simulations indicated that the reservoir would have exceeded its maximum capacity even in the most favorable scenario, highlighting the exceptional nature of the event. In August, the reservoir still remained above the safety margin, prompting the decision to activate the valves with the purpose of reaching the margin by the end of September. Simulations determined that this management inadvertently contributed to reducing the August floods for a considerable period. Overall, simulation results were compared with the actual operational capacity of the valves, discarding those suggesting an opening greater than what was realistically possible. The analysis concluded that the management carried out 4 at the Bullileo Reservoir adapted appropriately to the circumstances, allowing for the completion of the filling phase and prioritizing reservoir safety.
During the winter of 2023, the Central Chile region was affected by the arrival of two atmospheric rivers. The unusual combination of climatological variables influencing the intensity of this phenomenon caused flooding in the Maule, Ñuble, and Biobío regions. The events in June and August led to the majority of reservoirs being impacted, with the Bullileo Reservoir being the only one to exceed its maximum capacity in both occurrences. Consequently, a simulation model was implemented with the aim of analyzing different scenarios for managing the reservoir's outflow to regulate flood control. In June, simulations indicated that the reservoir would have exceeded its maximum capacity even in the most favorable scenario, highlighting the exceptional nature of the event. In August, the reservoir still remained above the safety margin, prompting the decision to activate the valves with the purpose of reaching the margin by the end of September. Simulations determined that this management inadvertently contributed to reducing the August floods for a considerable period. Overall, simulation results were compared with the actual operational capacity of the valves, discarding those suggesting an opening greater than what was realistically possible. The analysis concluded that the management carried out 4 at the Bullileo Reservoir adapted appropriately to the circumstances, allowing for the completion of the filling phase and prioritizing reservoir safety.
Description
Tesis presentada para optar al título de Ingeniero Ambiental
Keywords
Embalses - Chile, Crecidas, Embalses - Aspectos ambientales